* Reference: Intel Architecture Software Developer's Manual, Volume 3: System Programming
*/
+#include <stddef.h>
#include <console/console.h>
#include <device/device.h>
#include <cpu/x86/msr.h>
return resultk;
}
+static void set_fixed_mtrr_resource(void *gp, struct device *dev, struct resource *res)
+{
+ unsigned int start_mtrr;
+ unsigned int last_mtrr;
+ start_mtrr = fixed_mtrr_index(resk(res->base));
+ last_mtrr = fixed_mtrr_index(resk((res->base + res->size)));
+ if (start_mtrr >= NUM_FIXED_RANGES) {
+ return;
+ }
+ printk_debug("Setting fixed MTRRs(%d-%d) Type: WB\n",
+ start_mtrr, last_mtrr);
+ set_fixed_mtrrs(start_mtrr, last_mtrr, MTRR_TYPE_WRBACK);
+
+}
+
+struct var_mtrr_state {
+ unsigned long range_startk, range_sizek;
+ unsigned int reg;
+};
+
+void set_var_mtrr_resource(void *gp, struct device *dev, struct resource *res)
+{
+ struct var_mtrr_state *state = gp;
+ unsigned long basek, sizek;
+ if (state->reg >= BIOS_MTRRS)
+ return;
+ basek = resk(res->base);
+ sizek = resk(res->size);
+ /* See if I can merge with the last range
+ * Either I am below 1M and the fixed mtrrs handle it, or
+ * the ranges touch.
+ */
+ if ((basek <= 1024) || (state->range_startk + state->range_sizek == basek)) {
+ unsigned long endk = basek + sizek;
+ state->range_sizek = endk - state->range_startk;
+ return;
+ }
+ /* Write the range mtrrs */
+ if (state->range_sizek != 0) {
+ state->reg = range_to_mtrr(state->reg, state->range_startk, state->range_sizek, basek);
+ state->range_startk = 0;
+ state->range_sizek = 0;
+ }
+ /* Allocate an msr */
+ state->range_startk = basek;
+ state->range_sizek = sizek;
+}
+
void x86_setup_mtrrs(void)
{
/* Try this the simple way of incrementally adding together
* mtrrs. If this doesn't work out we can get smart again
* and clear out the mtrrs.
*/
- struct device *dev;
- unsigned long range_startk, range_sizek;
- unsigned int reg;
+ struct var_mtrr_state var_state;
printk_debug("\n");
/* Initialized the fixed_mtrrs to uncached */
/* Now see which of the fixed mtrrs cover ram.
*/
- for(dev = all_devices; dev; dev = dev->next) {
- struct resource *res, *last;
- last = &dev->resource[dev->resources];
- for(res = &dev->resource[0]; res < last; res++) {
- unsigned int start_mtrr;
- unsigned int last_mtrr;
- if (!(res->flags & IORESOURCE_MEM) ||
- !(res->flags & IORESOURCE_CACHEABLE))
- {
- continue;
- }
- start_mtrr = fixed_mtrr_index(resk(res->base));
- last_mtrr = fixed_mtrr_index(resk((res->base + res->size)));
- if (start_mtrr >= NUM_FIXED_RANGES) {
- continue;
- }
- printk_debug("Setting fixed MTRRs(%d-%d) Type: WB\n",
- start_mtrr, last_mtrr);
- set_fixed_mtrrs(start_mtrr, last_mtrr, MTRR_TYPE_WRBACK);
- }
- }
+ search_global_resources(
+ IORESOURCE_MEM | IORESOURCE_CACHEABLE, IORESOURCE_MEM | IORESOURCE_CACHEABLE,
+ set_fixed_mtrr_resource, NULL);
printk_debug("DONE fixed MTRRs\n");
+
/* Cache as many memory areas as possible */
/* FIXME is there an algorithm for computing the optimal set of mtrrs?
* In some cases it is definitely possible to do better.
*/
- range_startk = 0;
- range_sizek = 0;
- reg = 0;
- for(dev = all_devices; dev; dev = dev->next) {
- struct resource *res, *last;
- last = &dev->resource[dev->resources];
- for(res = &dev->resource[0]; res < last; res++) {
- unsigned long basek, sizek;
- if (!(res->flags & IORESOURCE_MEM) ||
- !(res->flags & IORESOURCE_CACHEABLE)) {
- continue;
- }
- basek = resk(res->base);
- sizek = resk(res->size);
- /* See if I can merge with the last range
- * Either I am below 1M and the fixed mtrrs handle it, or
- * the ranges touch.
- */
- if ((basek <= 1024) || (range_startk + range_sizek == basek)) {
- unsigned long endk = basek + sizek;
- range_sizek = endk - range_startk;
- continue;
- }
- /* Write the range mtrrs */
- if (range_sizek != 0) {
- reg = range_to_mtrr(reg, range_startk, range_sizek, basek);
- range_startk = 0;
- range_sizek = 0;
- if (reg >= BIOS_MTRRS)
- goto last_msr;
- }
- /* Allocate an msr */
- range_startk = basek;
- range_sizek = sizek;
- }
- }
+ var_state.range_startk = 0;
+ var_state.range_sizek = 0;
+ var_state.reg = 0;
+ search_global_resources(
+ IORESOURCE_MEM | IORESOURCE_CACHEABLE, IORESOURCE_MEM | IORESOURCE_CACHEABLE,
+ set_var_mtrr_resource, &var_state);
last_msr:
/* Write the last range */
- reg = range_to_mtrr(reg, range_startk, range_sizek, 0);
+ var_state.reg = range_to_mtrr(var_state.reg, var_state.range_startk, var_state.range_sizek, 0);
printk_debug("DONE variable MTRRs\n");
printk_debug("Clear out the extra MTRR's\n");
/* Clear out the extra MTRR's */
- while(reg < MTRRS) {
- set_var_mtrr(reg++, 0, 0, 0);
+ while(var_state.reg < MTRRS) {
+ set_var_mtrr(var_state.reg++, 0, 0, 0);
}
/* enable fixed MTRR */
printk_spew("call enable_fixed_mtrr()\n");
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